Improvement in chemical telegraphs



T. A. EDISON. Chemical"Te'leg'raphs. .N0.147,3I3. PatmdFeb'moAsm,

NEW YORK gig m: NORRIS Firms :0, PHoTo-u'ma, WASHINGTON. n. c,

UNITED STATES PATENT OFFIC THOMAS A. EDISON, or NEWARK, NEW JEnsEY, ASSIGNOR To HIMSELF AND oEoReE HARRINGTON, or WAsErNeToN, 11- e.

IMPROVEMENT IN CHEMICAL TELEGRAPHS.

Specification forming part of Letters Patent No. 147,313, dated February 10,1874; application filed July 29,1873.

To all whom it may concern:

Be it known that I, THOMAS A. EDrsoN, of Newark, in the county of Essex and State of New Jersey, have invented an Improvement in Chemical Telegraphs, of which the following is a specification:

In Letters Patent granted to me February 4, 1873, and numbered 135,531, a helix or lung- -net is employed in a shunt or derived circuit to neutralize the attenuations of the pulsations in the main circuit, and prevent the tailing upon the chemical paper.

The object of the present invention is to adjust the counter or reacting force or the magnets or helices at the receiving station, and

also to adjust the reacting forceof the magnets or helices at the transmitting stat-ion, so as to vary the action of the helices to suit the battery or the conditions of the pulsations at the transmitting and receiving stations.

In the annexed diagram, a, is the transmitting-instrument, in which the strip of perforated paper is employed to make and break the circuit. bis the receiving-instrument for the strip of chemical paper. 0 is the main' line; d, the main batter e e, the ground-connections. f is a branch circuit to the earth, in which the induction-coils or magnets g are in troduced, as in aforesaid patent. h are the induction-coils at the receiving station, and the action of the same corresponds'with that set forth in said patent. I, however, employ several electro-magnets or induction-coils, connected together through the contact-pins 2 2,

and these are arranged in the are of a circle,

CASE

m, and the elcctro-magncts or inductioncoils h, switch 7:, and contactpins 2 2, so that there may be more or less reactionary effect of the helices h.to cutofl' the tailings upon the main line, because, when the circuit is closed at the transmitting-instrument a, a large portion of the battery-power passes through-the shunt 5, switch 7;, coils l1, and rheost-at, and there is an accumulation of energy in the helices 71,. and as soon as the circuit through the instrument a is broken, the magnets h discharge themselves with more or less power, according to the number of said helices that are brought into the circuit; and this discharge, being in an opposite direction to the current of the battery, acts to clear the line of any surplus or static electricity, and prevent tailing.

It will be evident that the reactionary effect of the inductioncoil or magnets in the shuntcircuit at the transmitting stat-ion is to neutralize static electricity, or to bring the line to a normal electric condition instantly, thereby great] y promoting the rapidity of action.

Either the positive or the negative of the transmitting"battery may be to the line, and

tro-ma-gnets and a switelnk, to connect more.

or less oi'said magnets in a shunt-circuit, for the purposes set forth.

Signed by me this 23d day of April, A. D. 1873.

THOMAS A. EDISON. Witnesses:

Gate. 1. PrNcKNEY, GHAs. H. SMITH. 

